Kavli Affiliate: Renxin Xu
| First 5 Authors: Wei-Yang Wang, Xiaohui Liu, Dongzi Li, Bing Zhang, Chen-Hui Niu
| Summary:
Frequency-dependent polarization properties provide crucial insights into the
radiation mechanisms and magnetic environments of fast radio bursts (FRBs). We
explore an analytical solution of radiative transfer of the polarization
properties of FRBs as a strong incoming wave propagates in a homogeneous
magnetized plasma. The case of a thermal plasma is studied in more detail. The
rotational axis of the polarization spectrum undergoes precession with
frequency on the Poincar’e sphere when the medium has both strong Faraday
rotation and conversion. Such precession on the Poincar’e sphere could occur
in hot or cold plasma with a strong magnetic field component perpendicular to
the line of sight. The analytical solution with the mixing Faraday case offers
a more physical description of the physical properties of the magnetic
environment of FRBs than the empirical “generalized Faraday rotation” method
commonly adopted in the literature. Significant absorption can exist in a dense
plasma medium, which may give rise to a highly circularly polarized outgoing
wave. The frequency-dependent Stokes parameters may be associated with
reversing rotation measures or the presence of a persistent radio source around
an FRB.
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